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Re: [PATCH 3/4] pc-bios/s390-ccw: Silence GCC 11 stringop-overflow warni

From: Thomas Huth
Subject: Re: [PATCH 3/4] pc-bios/s390-ccw: Silence GCC 11 stringop-overflow warning
Date: Mon, 3 May 2021 11:31:31 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0

On 03/05/2021 11.30, Philippe Mathieu-Daudé wrote:
On 5/3/21 11:00 AM, Cornelia Huck wrote:
On Sun,  2 May 2021 19:48:35 +0200
Thomas Huth <thuth@redhat.com> wrote:

From: Philippe Mathieu-Daudé <philmd@redhat.com>

When building on Fedora 34 (gcc version 11.0.0 20210210) we get:

   In file included from pc-bios/s390-ccw/main.c:11:
   In function ‘memset’,
       inlined from ‘boot_setup’ at pc-bios/s390-ccw/main.c:185:5,
       inlined from ‘main’ at pc-bios/s390-ccw/main.c:288:5:
   pc-bios/s390-ccw/libc.h:28:14: warning: writing 1 byte into a region of size 
0 [-Wstringop-overflow=]
      28 |         p[i] = c;
         |         ~~~~~^~~

The offending code is:

   memset((char *)S390EP, 0, 6);

where S390EP is a const address:

   #define S390EP 0x10008

The compiler doesn't now how big that pointed area is, so assume its

s/assume/it assumes that/

Oops, thanks. Thomas, do you want me to repost this patch fixed?

I can fix it up in my tree here, no need to resend.


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